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WordReference Random House Learner's Dictionary of American English © 2024bound•a•ry /ˈbaʊndəri, -dri/USA pronunciation n. [countable], pl. -ries. - something that indicates bounds or limits, as a line:A mountain range forms a natural boundary between the two countries.
boundary, border, frontier refer to something that divides one territory, state, country, etc., from another. boundary most often refers to a line on a map; it may be a physical feature, such as a river: Boundaries on this map are shown in red. border refers to a political or geographic dividing line; it may also refer to the region next to the actual line: crossing the Mexican border. frontier refers specifically to a border between two countries or the region adjoining this border: Soldiers guarded the frontier between Russia and China. WordReference Random House Unabridged Dictionary of American English © 2024bound•a•ry (boun′də rē, -drē),USA pronunciation n., pl. -ries. - something that indicates bounds or limits;
a limiting or bounding line. - MathematicsAlso called frontier. the collection of all points of a given set having the property that every neighborhood of each point contains points in the set and in the complement of the set.
- [Cricket.]a hit in which the ball reaches or crosses the boundary line of the field on one or more bounces, counting four runs for the batsman. Cf. six (def. 5).
- 1.See corresponding entry in Unabridged Boundary, border, frontier share the sense of that which divides one entity or political unit from another. Boundary, in reference to a country, city, state, territory, or the like, most often designates a line on a map:boundaries are shown in red.Occasionally, it also refers to a physical feature that marks the agreed-upon line separating two political units:The Niagara River forms part of the boundary between the United States and Canada.Border is more often used than boundary in direct reference to a political dividing line; it may also refer to the region (of, for instance, a country) adjoining the actual line of demarcation:crossing the Mexican border; border towns along the Rio Grande.Frontier may refer to a political dividing line:crossed the Spanish frontier on Tuesday.It may also denote or describe the portion of a country adjoining its border with another country (towns in the Polish frontier) or, especially in North America, the most remote settled or occupied parts of a country:the frontier towns of the Great Plains.Frontier, especially in the plural, also refers to the most advanced or newest activities in an area of knowledge or practice:the frontiers of nuclear medicine.
Collins Concise English Dictionary © HarperCollins Publishers:: boundary /ˈbaʊndərɪ -drɪ/ n ( pl -ries)- something that indicates the farthest limit, as of an area; border
- the marked limit of the playing area
- a stroke that hits the ball beyond this limit
- the four runs scored with such a stroke, or the six runs if the ball crosses the boundary without touching the ground
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